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Username Post: >>95 CHEVY 5.7 350 TBI TIMING MISFIRING HELP        (Topic#254198)
Chevy_SS 
Forum Newbie
Posts: 8

Reg: 12-11-10
12-11-10 10:52 PM - Post#2016801    

New to this site:

I have a 1995 Chevy !500 x-cab with 350 tbi (which I was told is not the original motor but don't know), I got the truck while it was running rough and wanted to fix it so here is what I have done

Replaced the Timing chain and gears with Double roller set up (old chain had plenty of slack in the chain)
Replaced plugs, wires, cap rotor,single mounted coil replaced.
When doing the timing we made sure that the cam sprocket was at 6 o'clock and that the #1 piston was at TDC, and making sure that the distributor rotor was pointing at the #1 Cylinder direction and of course aligned the cam gear at 12 0'clock so dot for dot was lined up on each sprocket.

SO after that was completed and put back together tried to start and got nothing so we turned the distributor many positions i between trying to start it and we got back fire through out the throttle body but in order for us to get any type of running out of it we had to turn the distributor at 180 degrees out but still ran like poopoo, and under load it had nothing, with the distributor being in that position (180 degrees from being pointed at #1 cylinder in order to get it to start but poorly has me stuck) and also all the push rods are pushing out oil, all the lifters are moving so I was ruling out it being a worn cam, but don't know...

Please help need to get this truck sold asap to pay my mortgage

 
Low priced Genuine GM Auto Parts
Chevy_SS 
Forum Newbie
Posts: 8

Reg: 12-11-10
12-11-10 10:54 PM - Post#2016802    
    In response to Chevy_SS

And yes I did make sure I lined the factory setting notch on the key way of the crank gear did not advance or retard.

 
Chevy_SS 
Forum Newbie
Posts: 8

Reg: 12-11-10
12-11-10 11:12 PM - Post#2016808    
    In response to Chevy_SS

I was doing some reading about a "tan wire" behind the glove box, can someone explain how the procedure is done RE: Setting the timing that has to do with disconnecting the wire:
and can this be done since the truck does not run at this point?

 
boogie 
Senior Member
Posts: 2151
boogie
Loc: Louisiana
Reg: 07-11-02
12-12-10 04:46 AM - Post#2016849    
    In response to Chevy_SS

First off,the cam gear dot has to at 12 oclock and the crank gear dot at 12 oclock for you to be at #1 firing position. I allways line the dots (cam at 6 crank at 12) then turn engine over 360┬║ before dropping in the distributor.

there is a tan wire/black stripe taped to a wire loom inside the passenger compartment below the glove box/dash on a '95. once you get your distributor in right and running,disconnect this wire and set timing to 0┬║. reconnect when done.
'85 GMC C1500 SWB 355 sbc


 
Chevy_SS 
Forum Newbie
Posts: 8

Reg: 12-11-10
12-12-10 10:21 AM - Post#2016968    
    In response to boogie

Sorry I meant cam at 6 and crank at 12 to be lined up and so I have dropped that distributor in and lined it up so the rotor is pointing at no 1, but u saying it won't make a difference if that est wire is still connected when doing so? That I have to disconnect that wire first, re- stab the the distributor crank the engine (should it run at this point) then shut it off and then plus the wire back in?

 
Chevy_SS 
Forum Newbie
Posts: 8

Reg: 12-11-10
12-12-10 10:23 AM - Post#2016970    
    In response to boogie

Sorry I copied what u posted :

"First off,the cam gear dot has to at 12 oclock and the crank gear dot at 12 oclock for you to be at #1 firing position."

Not getting that, u saying I need to line both cam and crank dots at 12 0'clock? Not pointing at each other?

 
355Cheyenne 
Senior Member
Posts: 3765
355Cheyenne
Loc: Northern MN
Reg: 10-27-04
12-12-10 12:17 PM - Post#2017010    
    In response to Chevy_SS

When stabbing the dist. in the wire connected or disconnected makes no difference. The wire is the wire that goes from ecu to distributor so the ecu can adjust timing. With the engine off all of this is moot, I mean the wires are disconnected from the dist anyway when stabbing and well anyway. When you disconnect the wire the computer looses ability to adjust timing and it should return to zero position and this is when you set the motor to zero degrees. Either way, with the wire connected or not the engine should start. if it doesn't then something else is going on, be it something not connected correctly or timing to far off.
98 Silverado k1500 4x4 350


 
boogie 
Senior Member
Posts: 2151
boogie
Loc: Louisiana
Reg: 07-11-02
12-12-10 04:39 PM - Post#2017103    
    In response to Chevy_SS

If you stabbed the distributor in with the rotor pointing to #1 with the dots together on the timing gears which is the #6 firing position,you will be 180 out.

Since you have the front cover back on...remove the #1 spark plug,hold on finger over the hole and have someone bump the starter over,when you feel pressure stop and manually turn engine over until the mark on balancer lines up with 0 on the timing scale. you can now reinstall the distributor with rotor pointing at #1.
'85 GMC C1500 SWB 355 sbc


 
Chevy_SS 
Forum Newbie
Posts: 8

Reg: 12-11-10
12-12-10 07:16 PM - Post#2017170    
    In response to boogie

ok so when manually turning the engine over with the est wire un-plugged also have the distributor out, then when marks are lined up re-stab the dist pointing at number 1?

 
355Cheyenne 
Senior Member
Posts: 3765
355Cheyenne
Loc: Northern MN
Reg: 10-27-04
12-12-10 07:18 PM - Post#2017174    
    In response to Chevy_SS

close enough. The est wire needs to be unplugged to set your base running timing. so once running, unplug the est wire and with a timing light set to zero degrees.
98 Silverado k1500 4x4 350


 
Chevy_SS 
Forum Newbie
Posts: 8

Reg: 12-11-10
12-12-10 07:24 PM - Post#2017177    
    In response to 355Cheyenne

  • 355Cheyenne Said:
close enough. The est wire needs to be unplugged to set your base running timing. so once running, unplug the est wire and with a timing light set to zero degrees.



OK but do I still need to have the wire disconnected at this point (not running) while re-stabbing the dist. and manually crank engine so mark is lined up on the HB at zero? or wait to unplug the wire after I get it running (which gets me stuck cause I figured with this wire plugged in with me trying to re-stab the dist, line the marks up once I start it the ecu will fight against me>(unless I unplug that wire first before I attempt to start>am I wrong) So damn fustrated

 
boogie 
Senior Member
Posts: 2151
boogie
Loc: Louisiana
Reg: 07-11-02
12-13-10 04:26 AM - Post#2017257    
    In response to Chevy_SS

Dont even worry about the wire until you get it running and ready to set final timing.
'85 GMC C1500 SWB 355 sbc


 
355Cheyenne 
Senior Member
Posts: 3765
355Cheyenne
Loc: Northern MN
Reg: 10-27-04
12-13-10 06:48 AM - Post#2017306    
    In response to boogie

  • boogie Said:
Dont even worry about the wire until you get it running and ready to set final timing.




Agreed. That wire you are talking about is one of the couple wires on the harness that plug into the distributor. So when stabbing you have to have the wires disconnected to the dist. regardless it would be disconnected, but the point is moot because the wire isn't doing anything with the truck not running.

This wire allows the ecu to send a signal to adjust timing in the distributor. Ignition off ecu is off anyway and even if you had ignition on and all wires on the distributor while stabbing it still wouldn't move the timing enough to affect anything.
98 Silverado k1500 4x4 350


 
Chevy_SS 
Forum Newbie
Posts: 8

Reg: 12-11-10
12-13-10 05:51 PM - Post#2017628    
    In response to 355Cheyenne

Thank u all for your help will keep posted

 
Low priced Genuine GM Auto Parts
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